Safety lock



Aug. 27, 1940. v. J. GIARDINA SAFETY LOCK Filed Aug. 19, 1959 PatentedAug. 27, 1940 ,if UNITED STATES PATENT OFFICIEL .SAFETY LOCK VincentGiardina, Baton Rouge, La.

Application August 19, 1939, Serial No.` 291,092

' 1 Claim. A(Gl. 292-129) lThe present invention relates to improvementsin safety locks, and has for an object to provide a burglar proof hookand keeper to be attached to door frames and to either screen or soliddoors which will offer a maximum of safety against the insertion of anytool or jimmy used to lift the hook from the keeper eye.

It is another object ofthe invention to provide an improved safety lockin which the device is intended and calculated to hold the hook rmly inthe keeper eye unless released from within the house by an intendedretraction of the hook and its confining spring.

A further object of the invention is to improve the construction of thehook and its bill whereby a novel cooperation takes place between thehook and its keeper contributed to by the spring which maintains atension upon the hook and whereby the hook will interlock with thekeeper in such a manner that it will be diii'cult to dislodge the sameexcept by a conscious eifort in two predetermined directions which canbe expeditiously executed only within the building or room guarded bythe improved safety lock.

With the foregoing and other objects in View, the invention will be morefully described hereinafter, and will be more particularly pointed outin the claim appended hereto.

In the drawing, wherein like symbols refer to like or correspondingparts throughout the several views,

Figure 1 is a fragmentary front elevation of a door and door frameshowing the improved safety lock in locked position and with partsthereof broken away and parts shown in section.

Figure 2 is a top plan View of the same.

Figure 3 is a fragmentary side View of the hook raised out of thekeepershown in section and with dotted lines'showing the hook as moveddown into the keeper.

Figure 4 is a side View of the hook shank partially broken away and withthe cooperating coil spring shown in section, and

Figure 5 is "a side view of the casing and a part of the hook shankshowing in section a modied form of device.

Referring more particularly to the drawing 6 designates a door and 'i adoor frame. Upon one or other of these parts is mounted the keeper eye 8and upon the other cooperating part is the screw eye 9 upon which isswivelly mounted a casing or sleeve Ill. At one end such casing orsleeve I0 is formed with a perforated flattened part II while at itsother end the casing I0 is turned in for a purpose later described. InFigure 5 a modication is shown in which the turned in end I2 is replacedby the screw threads I3; and-the nut` I4.

` Either the inturned end I2 or the nut I4 extends closely about theshank I5 of the hook whereby the shank I5 may have a longitudinallysliding t at one end in the casing I0. At this conned end the shank I5is enveloped ,by a coil spring I6, one end of which abuts against and isconned by the inturned casing end I2' or the end of the nut I4 of Figure5.

The opposite end of the coil spring I6 may be afxed to the shank I5 inany appropriate manner, for instance as shown in Figure 4, where the endor terminal convolution or helix I8 of spring I6 is wound tightly withinthe groove I'I formed near the inner end of the shank I5.

-The thrust of Athe coil spring I6 reacting against the inturned end I2or nut I4 and developed through end helix I8 and groove II tends to movethe shank I5 inwardly of the casing yet enables the shank I5` to bedrawn out through a compressive action of the spring.

At its outer free end the shank I5 is formed into a hook, the componentparts of which are a goose neck I9 and the bill 2l with its reverselycurved part 22. A curved portion lies between the shank I5 and the gooseneck I9, this curved portion being a part of the one piece metallic rodwith the shank I5 and the hook. It will of course be understood thatthese parts may be made separately if desired. The reversely curved part22 is formed with an inclined shoulder 23, the shoulder terminatingadjacent the constricted throat 24 through which the keeper 8 rather.narrowly passes.

The higher end of the inclined shelf or shoulder 23 is formed oppositethe curved portion 20. Therefore this higher end and the portion 20approach one another and form a narrow throat.

In the use of Athe device, the reversely curved wall 22 produces arounded extremity 25 which encounters the keeper 8 when the hookdescends, it being understood that the spring I6 is so selected as tostrength and its distended positionl as to draw the hook and its shankto the right so that the normal position of the hook will be asindicated in Figure 3 when it is freed from the keeper and when it isbrought down upon the keeper. The hook will be held by spring I6 in thisposition of tension. However when the rounded extremity 25 engagesvtherounded portion of the keeper eye 8 and the hook is forced further down,the right hand edge of part 22 will ride down upon the rounded keeperpart 8 and shift the bill and the shank over to the left, thuscompressing the spring I6. The rounded portion 2l! will tend to guidethe keeper 8 into the narrow throat 2li and into the conned space withingoose neck BS. As soon as the hook is forced down sufficiently so thatthe keeper 8 clears the shoulder 23, the coil spring l5 will snap thehook back to the right thus causing the bill 2l to be brought againstthe keeper 8 in alinement with the reversely curved part 22, and willcause the keeper to lie upon shoulder 23. The inclined shoulder willride up on the lower part of the keeper as the spring IG pulls the shankand hook in the right hand direction. The higher part of the inclinedshoulder 23- being toward the right that isi-toward the free edge of theshoulder, will prevent the keeper from riding off such shoulder; orrather will prevent the shoulder from backing off the keeper. The highend of shoulder 23 performs a further function of extending toward thecurved portion 20 and serving to narrow down the throat 24.

The coil spring ES contributes to hold the keeper upon the inclinedshoulderv23 and within the confined space within the goose neck I9 andfrom escaping through throat 24, while the inclination of the shoulder23 makes it diicult for the hook to back off or raise up from thekeeper.

It is obvious that various changes and modifications may be made in thedetails of construction and design of the above specifically describedembodiment of this invention without departing from the spirit thereof,such changes and modifications being restricted only by the scope of thefollowing claim.

What is claimed is:

l In combination with a keeper, a spring pressed hook comprising a billhaving a gooseneck portion for coniining an enclosed space to receivesaid keeper with an open throat portion, a bill on said hook forming athickened portion across said throat for narrowing the throat and alsoproviding a shelf inwardly of the throat and within said enclosed space,said shelf being inclined with its upper portion lying next to thethroat.

i VINCENT J. GIARDINA.

